I can understand someone feeling inferior or worthless, and how bad that is, but i can’t yet believe that self love is Biblical, apart from the natural way that each person takes care of themselves : Love your neighbor as you love yourself : Look after others in the same way that you look after yourself.
The reason for this is our identification with Christ in His death and resurrection, …I no longer live, but Christ lives in me. It’s this identification which lifts us up out of feeling worthless or inferior and gives us the only valid reason to live : to live for Him and not for ourselves. We take care of ourselves bcos we love Him, and love others, not bcos we love ourselves.
The question to ask is, When Jesus was on the earth did He love Himself? Did the Apostles love themselves? I would say, no.